They offer several things that grow here,I've even seen FL native plants.
Yes, some of the their offerings are not for Florida.
There's plenty of plants out there I'd certainly like to try that you just can't find anywhere BUT mail order.
If we all did everything by the book,it'd get boring fast.
Up until a couple of years ago had you ever seen a variegated flax lily(Dianella Tasmanica variegata) in FL.
Older garden books will tell you that plant is not suited for FL climate,go to ANY big box store and you'll discover
they were wrong. Just my 2 cents anyway.